Etch‐and‐rinse versus self‐etch strategy of a universal adhesive in different application methods at the bonding interface of fiber post cementation

Abstract

ObjectiveTo evaluate the effect of etch‐and‐rinse (ER) versus self‐etch (SE) strategies of a universal adhesive applied with a manual brush (MB) or rotary brush (RB) on the bonding interface of fiber post cementation.MethodsForty bovine incisor roots were prepared and divided into four groups according to the methods of application and strategy of universal adhesive use (MB‐ER, RB‐ER, MB‐SE and RB‐SE). After 6 months, specimens from different thirds of the post space were evaluated of push‐out strength, analysis of adhesive failure patterns, and extent of tags.ResultsThe RB‐ER and RB‐SE groups showed the highest bond strength values in the cervical and middle thirds of the post space. Cohesive adhesive failure had the highest incidence in the different thirds of the post space in the ER strategy, regardless of the adhesive application method. The RB‐ER group showed the highest tag extensions.ConclusionsThe protocols of universal adhesive application with RB provided the greater bond strength, but only the ER strategy favored the formation of a greater extension of tags at the adhesive interface.Clinical SignificanceThe application of universal adhesive with RB into the post space increases the strength of the post‐cemented fiber bond.

Evaluation of bond strength in customizing fiber post using translucent resins photoactivated by different light-emitting diodes

“…Some factors mentioned in the previous literature may interfere with the adhesion and, consequently, the strength of the fiber post, such as ineffective cleaning of the intraradicular dentin,[ 7 9 ] a thick layer of cementation material, and incomplete polymerization of the resin cement. [ 17 18 19 ] Another issue relates to irregularities and a lower number and diameter of dentinal tubules in the apical third,[ 20 ] which can also affect bond strength.…”

“…On the 8 th day, the roots were cross-sectioned at the level of the cementoenamel junction using a double-sided diamond disc (KG Sorensen, São Paulo, SP, Brazil), standardizing the sample length by 15 mm from the root apex. [ 9 ] Subsequently, the canal was prepared similarly to Leandrin et al . [ 3 ] Following the instrumentation, irrigation was carried out with 3 mL of 17% ethylenediaminetetraacetic acid (Biodinâmica, Ibiporã, PR, Brazil) for 3 min, followed by 5 mL of 2.5% sodium hypochlorite (Asfer, São Caetano do Sul, SP, Brazil).…”

“…[ 6 ] Currently, what has been observed in the literature are investigations of different methods of cleaning residues in the postspace resistance of the post, cement, and dentin assembly. [ 7 8 9 10 11 12 13 ] Evaluations of different resinous materials, specifically translucent resins for postcustomization, are still not extensively addressed. Therefore, the authors were encouraged to conduct this in vitro assay in an attempt to investigate whether the translucency of different resins influences the bond strength and adhesive failure pattern.…”

Evaluation of different mechanical cleaning protocols associated with 2.5% sodium hypochlorite in the removal of residues from the post space

“…The final irrigation was carried out with 17% ethylenediaminetetraacetic acid (EDTA) (Biodinâmica, Ibiporã, Paraná, Brazil), which was left in the root canal for 3 min, followed by 5 mL of 2.5% NaOCl. [ 13 ]…”

“…After placing the gutta-percha cone with endodontic sealer, the cervical access of the roots was sealed with temporary cement (Coltosol; Coltene, Rio de Janeiro, Brazil), and the roots were kept in an incubator at 100% relative humidity at 37°C for 7 days. [ 13 ]…”